WO2002066939A1 - Convertisseur deplacement/quantite de lumiere - Google Patents
Convertisseur deplacement/quantite de lumiere Download PDFInfo
- Publication number
- WO2002066939A1 WO2002066939A1 PCT/JP2002/001423 JP0201423W WO02066939A1 WO 2002066939 A1 WO2002066939 A1 WO 2002066939A1 JP 0201423 W JP0201423 W JP 0201423W WO 02066939 A1 WO02066939 A1 WO 02066939A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- diaphragm
- displacement
- receiving unit
- conversion device
- Prior art date
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 239000004065 semiconductor Substances 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
- H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
Definitions
- the present invention relates to a displacement light amount conversion device that converts mechanical vibration into an optical signal, and more particularly to a displacement light amount conversion device that can convert a minute mechanical displacement into a large light amount change.
- FIG. 4 An example of a conventional displacement light amount conversion device that converts mechanical vibration into an optical signal will be described with reference to FIGS. 4 and 5.
- FIG. 4 An example of a conventional displacement light amount conversion device that converts mechanical vibration into an optical signal will be described with reference to FIGS. 4 and 5.
- a planar diaphragm 4 is arranged so as to face the light emitting unit 2 and the light receiving unit 3 at a substantially constant distance d from them.
- the divergent light emitted from the light emitting unit 2 at a certain radiation angle is reflected by the diaphragm 4, and a part of the reflected light reaches the light receiving unit 3.
- FIG. 5 is a diagram showing the relationship between the distance d between the light emitting unit 2 and the light receiving unit 3 and the diaphragm 4 in FIG. 4 and the amount of light incident on the light receiving unit 3.
- the light emitting unit 2 has a constant radiation angle.
- the reflected light emitted by the diaphragm 4 and reflected by the diaphragm 4 does not reach the light receiving section 3.
- FIG. 6 is a graph showing the relationship between the distance d between the light emitting unit 2 and the light receiving unit 3 and the vibration plate 4 in FIGS. 4 and 5 and the amount of light incident on the light receiving unit 3.
- the change in the incident light amount with respect to the change in the distance d is large.
- the amount of light incident on the light receiving unit 3 changes linearly. It can be seen that the amount is detected.
- the divergent light emitted from the light emitting section 2 at a certain radiation angle reaches the light receiving surface of the light receiving section 3 as divergent light even after being reflected by the diaphragm 4. Therefore, the following problems occur. That is, since the divergent reflected light from the diaphragm 4 reaching the light receiving surface spreads in a circular shape around the light emitting unit 2, the light received by the light receiving unit 3 out of the total light amount radiated from the light emitting unit 2 The amount of light incident on the surface is greatly reduced. Therefore, it is difficult to greatly increase the sensitivity of diaphragm 4 to minute displacement even when a portion where the amount of light incident on light receiving unit 3 changes linearly is used.
- the diaphragm 4 may be moved closer to the light-emitting unit 1 and the light-receiving unit 3, but only by restricting the degree of freedom of the device design. It is difficult to increase the adjustment accuracy because the diaphragm 4 or the light emitting unit 2 and the light receiving unit 3 are moved.
- the present invention has been made in view of the above-described drawbacks of the conventional apparatus, and an object thereof is to provide a displacement light amount capable of easily and surely increasing detection sensitivity to minute displacement due to sound or the like of a diaphragm. It is to provide a conversion device.
- the diaphragm is disposed to face the light emitting unit and the light receiving unit, and the light emitted from the light emitting unit and reflected by the diaphragm is received by the light receiving unit.
- a displacement light amount conversion device for converting a displacement of a diaphragm into an output of the light receiving unit a diaphragm having a concave shape is used and the concave surface is arranged toward the light emitting unit and the light receiving unit.
- the concave surface is formed by rotating a curve 360 degrees around the central axis with a line passing through a midpoint between the light emitting unit and the light receiving unit and perpendicular to the diaphragm as a central axis. It has a curved surface.
- the rotation curve surface is formed by rotating a part of a circle having a radius of curvature with a line connecting the midpoint between the light emitting portion and the light receiving portion and the diaphragm to 360 degrees around the central axis. With a spherical surface.
- the rotation curve surface may be configured by rotating one of a parabola, an ellipse, and other curves or a part of a curve obtained by combining those curves by 360 degrees around the central axis. Good.
- the light emitting section and the light receiving section are incorporated in the same package.
- the light emitting section is constituted by a semiconductor laser element.
- the light emitting section is constituted by a vertical cavity surface emitting laser element.
- FIG. 1 is a diagram showing an overall configuration of a displacement light amount converter according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a relationship between reflected light and a light receiving unit when the distance between the light emitting unit and the light receiving unit and the diaphragm is changed in the apparatus of FIG.
- FIG. 3 is a graph showing a change in the amount of incident light in the light receiving unit when the distance between the light emitting unit and the light receiving unit and the diaphragm is changed as in FIG.
- FIG. 4 is a diagram showing the overall configuration of a conventional displacement light amount conversion device.
- FIG. 5 is a diagram showing the relationship between the reflected light and the light receiving unit when the distance between the light emitting unit and the light receiving unit and the diaphragm is changed in the apparatus of FIG.
- FIG. 6 is a graph showing a change in the amount of incident light in the light receiving unit when the distance between the light emitting unit and the light receiving unit and the diaphragm is changed as shown in FIG.
- FIG. 7 is a graph showing a comparison between the amount of incident light of the displacement light receiving unit of the displacement light amount conversion device according to the embodiment of the present invention and the displacement light amount conversion device of the related art.
- FIG. 1 is a diagram showing an overall configuration of a displacement light amount conversion device according to an embodiment of the present invention.
- the light emitting section 2 and the light receiving section 3 are incorporated in the same package, and at a distance d from them, a concave-shaped vibration plate 1 concave receiving portion 3 c the diaphragm 1 is disposed toward the central axis line perpendicular to the light emitting portion 2 and the front through the intermediate point P SL diaphragm 1 between the light receiving portion 3 X- X ′ is a rotation curve surface formed by rotating the curve R by 360 degrees around the central axis X—X ′.
- the curve R is, for example, a part of a circle having a radius of curvature r as a line connecting an intermediate point P between the light emitting unit 2 and the light receiving unit 3 and the diaphragm 1, and By rotating 360 degrees around X—X ', a spherical surface is formed as a rotation curve surface. By using such a rotation curve surface, the light radiated from the light emitting unit 2 is collected near the light receiving unit 3.
- the Rukoto is, for example, a part of a circle having a radius of curvature r as a line connecting an intermediate point P between the light emitting unit 2 and the light receiving unit 3 and the diaphragm 1, and By rotating 360 degrees around X—X ', a spherical surface is formed as a rotation curve surface. By using such a rotation curve surface, the light radiated from the light emitting unit 2 is collected near the light receiving unit 3.
- the Rukoto is, for example, a part of a circle having a radius of
- FIG. 2 is a diagram showing the relationship between the distance d between the light emitting unit 2 and the light receiving unit 3 and the diaphragm 1 and the amount of light incident on the light receiving unit 3 in the apparatus of FIG.
- the light emitting unit 2 has a constant radiation angle.
- the reflected light emitted by the diaphragm 1 and reflected by the diaphragm 1 does not enter the light receiving unit 3.
- FIG. 3 is a graph showing the relationship between the distance d between the light emitting unit 2 and the light receiving unit 3 and the diaphragm 1 and the amount of light incident on the light receiving unit 3.
- the change in the distance d causes a large change in the amount of incident light.
- the amount of light incident on the light receiving section 3 changes linearly when the diaphragm 1 is slightly displaced (up and down direction of the diaphragm 1 in FIGS. 1 and 2), and the amount of minute displacement is detected by detecting the amount of change. It is understood that it is done.
- the diaphragm 1 of the embodiment reflects the light emitted from the light emitting unit 2 at a certain radiation angle as a convergent light, and the reflected light is collected near the light receiving unit.
- the light receiving unit 3 receives more light than the diaphragm 4. Therefore, the difference between the total amount of light emitted from the light emitting unit 2 and the amount of light incident on the light receiving unit 3 is reduced, and the sensitivity of the diaphragm 1 to minute displacement can be increased.
- FIG. 7 shows a comparison of the ratio of the amount of incident light of the light receiving unit 3 to the amount of light emitted from the light emitting unit 2 in the displacement light amount conversion device according to the embodiment of the present invention and the conventional displacement light amount conversion device.
- the shape of the diaphragm is such that the divergent light emitted from the light-emitting part 2 at a certain radiation angle is collected near the light-receiving part 3 as a convergent light, like a parabolic or toric surface.
- the shape may be a concave surface, and is not limited to a rotation curve surface such as a spherical surface.
- a curve formed by rotating a part of a curve formed by combining a parabola, an ellipse, and another curve around the central axis by 360 degrees may be used.
- the diaphragm reflects the light emitted from the light emitting portion at a fixed emission angle as convergent light, and the reflected light is condensed near the light receiving portion, so that the divergence is obtained.
- the light receiving portion receives more light than the conventional diaphragm which is reflected as light. Therefore, the difference between the total amount of light emitted from the light emitting unit and the amount of light incident on the light receiving unit, that is, the loss of light amount is reduced, and the detection sensitivity to minute displacement of the diaphragm can be increased.
- the distance between the light emitting unit and the light receiving unit to the diaphragm is equal to the radius of curvature of the curved surface of the diaphragm, the amount of light received by the light receiving unit can be increased without bringing the light emitting unit, the light receiving unit and the diaphragm close to each other. Therefore, the degree of freedom of the device design and the adjustment accuracy can be increased.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Measurement Of Optical Distance (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Semiconductor Lasers (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE0001371956T DE02712458T1 (de) | 2001-02-20 | 2002-02-19 | Verschiebung/lichtmenge-umsetzer |
US10/467,002 US7045768B2 (en) | 2001-02-20 | 2002-02-19 | Displacement/quantity of light converter |
EP02712458A EP1371956A4 (en) | 2001-02-20 | 2002-02-19 | CONVERTER DISPLACEMENT / QUANTITY OF LIGHT |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001042728A JP3828755B2 (ja) | 2001-02-20 | 2001-02-20 | 変位光量変換装置 |
JP2001-42728 | 2001-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002066939A1 true WO2002066939A1 (fr) | 2002-08-29 |
Family
ID=18904985
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/001423 WO2002066939A1 (fr) | 2001-02-20 | 2002-02-19 | Convertisseur deplacement/quantite de lumiere |
Country Status (5)
Country | Link |
---|---|
US (1) | US7045768B2 (ja) |
EP (1) | EP1371956A4 (ja) |
JP (1) | JP3828755B2 (ja) |
DE (1) | DE02712458T1 (ja) |
WO (1) | WO2002066939A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101401022B (zh) * | 2006-02-06 | 2010-07-21 | 诺基亚公司 | 在成像系统中进行位置检测的方法和设备 |
ITFI20070050A1 (it) | 2007-02-27 | 2008-08-28 | El En Spa | Sensore ottico a riflessione per determinare la posizione angolare di un elemento ruotante |
US8594507B2 (en) | 2011-06-16 | 2013-11-26 | Honeywell International Inc. | Method and apparatus for measuring gas concentrations |
US20120321322A1 (en) * | 2011-06-16 | 2012-12-20 | Honeywell International Inc. | Optical microphone |
JP6432260B2 (ja) * | 2014-09-30 | 2018-12-05 | 富士通株式会社 | 振動検出部品、これを用いた音響装置及び情報機器 |
CN105953905B (zh) * | 2016-04-21 | 2019-01-08 | 大连理工大学 | 一种基于棱镜折射信号放大的瞬态微振量测装置与方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04120428A (ja) * | 1990-09-12 | 1992-04-21 | Fujitsu Denso Ltd | 光振動センサ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3327584A (en) * | 1963-09-09 | 1967-06-27 | Mechanical Tech Inc | Fiber optic proximity probe |
US3389372A (en) * | 1965-06-23 | 1968-06-18 | Smiths Industries Ltd | Echo-ranging apparatus |
DE1537597A1 (de) * | 1966-11-22 | 1970-01-15 | Ceskoslovenska Akademie Ved | Photoelektrisches Mikrophon |
GB1584048A (en) * | 1977-09-07 | 1981-02-04 | Standard Telephones Cables Ltd | Optical transducers |
JPS57149000U (ja) * | 1981-03-12 | 1982-09-18 | ||
US4799751A (en) * | 1983-05-16 | 1989-01-24 | Gould Inc. | Detection device using fiber optic techniques |
US5995260A (en) * | 1997-05-08 | 1999-11-30 | Ericsson Inc. | Sound transducer and method having light detector for detecting displacement of transducer diaphragm |
DE60016170D1 (de) * | 1999-01-08 | 2004-12-30 | Ibsen Photonics As Farum | Spektrometer |
DE29922312U1 (de) * | 1999-11-02 | 2000-03-30 | Merlaku, Kastriot, 84347 Pfarrkirchen | Photonen-Mikrofon |
JP3953752B2 (ja) * | 2001-06-19 | 2007-08-08 | 株式会社ケンウッド | 光音響変換装置の振動板構造 |
-
2001
- 2001-02-20 JP JP2001042728A patent/JP3828755B2/ja not_active Expired - Fee Related
-
2002
- 2002-02-19 WO PCT/JP2002/001423 patent/WO2002066939A1/ja active Application Filing
- 2002-02-19 US US10/467,002 patent/US7045768B2/en not_active Expired - Lifetime
- 2002-02-19 EP EP02712458A patent/EP1371956A4/en not_active Withdrawn
- 2002-02-19 DE DE0001371956T patent/DE02712458T1/de active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04120428A (ja) * | 1990-09-12 | 1992-04-21 | Fujitsu Denso Ltd | 光振動センサ |
Also Published As
Publication number | Publication date |
---|---|
JP3828755B2 (ja) | 2006-10-04 |
US7045768B2 (en) | 2006-05-16 |
US20040090686A1 (en) | 2004-05-13 |
EP1371956A4 (en) | 2008-08-13 |
JP2002243410A (ja) | 2002-08-28 |
DE02712458T1 (de) | 2004-07-08 |
EP1371956A1 (en) | 2003-12-17 |
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